Heat sinks holding kit and storage rack for semiconductor chip

ABSTRACT

A heat sink holding kit and storage rack for semiconductor is disclosed. A plurality of heat sinks and chips are molded die to form a package, and a holding kit and a storage rack are used to rapidly arrange the heat sinks within the cavity of a mold.

BACKGROUND OF THE INVENTION

[0001] (a) Field of the Invention

[0002] The present invention relates to the field of semiconductor packaging, whereby a plurality of heat sinks and chips are molded die to form a package, and a holding kit and a storage rack are used to rapidly arrange the heat sinks within the cavity of a mold.

[0003] (b) Description of the Prior Art

[0004] For heat sinks used in miniature packaging device, the surface of the chip used by these devices is placed with the heat sinks so as to disperse heat at an enlarged surface. In the packaging manufacturing process, prior to the molding process, heat sinks are placed into the die manually. Due to the extremely thin heat sinks, the mounting of heat sinks into the die is very slow and the heat sinks may be contaminated during mounting thereof. Besides, manually stacking of heat sinks is laborious and time-consuming. Accordingly, it is an object of the present invention to provide heat sinks holding kit and storage rack for semiconductor chip which mitigate the above drawback.

SUMMARY OF THE INVENTION

[0005] Accordingly, it is an object of the present invention to provide a heat sinks holding kit and storage rack for semiconductor chip, wherein the heat sinks are prefabricated in groups, and prior to molding, one hand holds the holding kit and the heat sinks are mounted thereon, the heat sinks are rotatably mounted to the die so as to provide excellent heat dispersion efficacy.

[0006] Other objects, and advantages of the present invention can be more fully understood by reading the following detailed description of the preferred embodiment, with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

[0007]FIGS. 1A and 1B show an exploded view of a holding kit and a storage rack in accordance with the present invention.

[0008]FIG. 2 is a perspective view of the slanting slot of the forming hole at the bottom side of the rotating handle in accordance with the present invention.

[0009]FIG. 2A is an enlarged view of a portion of FIG. 2.

[0010]FIG. 3 is a perspective view of the storage rack in accordance with the present invention.

[0011]FIG. 4 is a schematic view showing the mounting of the heat sinks to the holding kit in accordance with the present invention.

[0012]FIGS. 5A, 5B, and 5C show the top, front and bottom view of the holding kit filled with heat sinks in accordance with the present invention.

[0013]FIG. 6 shows a schematic view of the holding kit and the molding die of package in accordance with the present invention.

[0014]FIG. 7 is a further preferred embodiment of the storage rack in accordance with the present invention.

DETAILED DESCRIPTION OF THE PRESENT INVENTION

[0015] Referring to FIG. 1, there is shown a heat sink holding kit 1 and a storage rack 2 in accordance with the present invention. The holding kit 1 comprises

[0016] (a) a top fixing block 12 being square in shape having a U-shape stepped hole 121, and the opening ends of the stepped hole 121 being provided with through hole 122 for the insertion of an insertion peg 14 and the top end of the stepped hole 121 being provided with screw hole 1211 for the positioning of positioning ball 1231 and a positioning device 123;

[0017] (b) a bottom fixing block 13 being a rectangular shape having a base edge 131 for positioning and having a rectangular through hole 132 for heat sinks at the top face thereof and a circular shallow slot 133 for the heat sink 3 to rotate within the circular shallow slot 133;

[0018] (c) a rotating handle 11 having a vertical hollow cylindrical body 110 being provided with a forming slot 113 at the center thereof to allow the insertion of heat sink 3 from the storage rack 2 so as to provide storage space for the heat sink 3, and a shallow slot (FIGS. 2 and 2A) is located at the bottom face of the hollow cylindrical body 110 forming by the revolution of 5 degree by the forming hole, as the rotating handle 11 rotates the heat sink 3 is maintained to move horizontally from the shallow slot so as to prevent the heat sink 3 from falling into the mold cavity 41 and the heat sink 3 can be horizontally placed within the cavity 41. Next the bottom of the cylindrical body has a protruded edge 111 so that the edge can engage with the stepped hole 121 and the bottom face of the cylindrical body and the top face of the positioning block 13 does not provide a gap. The lower side of the hollow cylindrical body 110 is provided with four equally distributed positioning holes which match the positioning device 123 of the upper fixing block 12. That is, in the course of positioning, the heat sinks 3 are aligned with the rectangular through hole 132 of the lower positioning block 13 so as to disperse heat.

[0019] In accordance with the present invention, the heat sinks 3 are rectangular thin plates having square-shaped hole 31 at both the end portions, and at the two sides of the square-shaped hole 31, protruded edge 32 is provided.

[0020] In accordance with the present invention, the storage rack 2 structure comprises:

[0021] (a) a base board 21 being rectangular in shape having a plurality of sets of four binding holes 211 on the top face thereof as a set of locking hole 212;

[0022] (b) a pair of supporting board 22 mounted at the two lateral sides of the base board 21 and fixed to the base board 21 by screw and a screw hole 221 provided on the supporting board 22 for the screwing of an upper covering plate 23;

[0023] (c) the upper covering plate 23 being a flat plate mounted at the top face of the supporting board 22 to cover the end face of the guiding peg 24 located on the locking hole 212 so as to prevent dislocation of the heat sinks 3 and the isolation blocks 25;

[0024] (d) a plurality of guiding pegs 24 mounted to the locking hole 212 on the base board 21 allowing the long heat sinks 3 passed through the guiding peg 24 alternately and stacked to form a column-like having inserted with the isolation block 25; and the guiding block 24 being inserted into the stacked heat sinks with a rotating handle and being able to withdraw from insertion.

[0025] In accordance with the present invention, in production, the base board 21 of the storage rack 2 and the two supporting board 22 are fastened to each other, and the guiding pegs 24 are inserted to the locking holes 212 and the heat sinks 3 are stacked alternatively on the guiding peg 24 and an isolation block 25 is mounted at the top end. After each of the locking hole 212 is fully arranged with heat sinks 3, the top cover board 23 is screwed to the top face of the two supporting board 22 with screw 231 so that the guiding peg 24, the heat sinks 3 and the isolation block 25 are limited to the fixing space, avoiding dislocation therefrom. Due to the predetermined number of the heat sinks 3, the heat sinks 3 can be first mounted onto the storage rack in groups (as shown in FIG. 3).

[0026] As shown in FIG. 4, for application, a group of storage rack 2 is withdrawn and the screw 231 is removed from the top covering board 23, and the isolation block 25 of one locking hole 212 is taken away so as to rotate the handle 11 to cover the four guiding peg 24 within a locking hole 212 and the heat sinks 3 thereon such that the heat sinks 3 are fully covered within the shape-forming hole 113 of the rotating handle 11. After that the four guiding pegs 24 are removed and a stopping pad 115 is used to lock to the screw hole of the upright hollow cylindrical body 110 so as to prevent the heat sinks 3 from dislocation from the shape-forming hole 113. At this moment, the rotating handle 11 can move around together with the heat sinks 3 on the top face of the base board 21. After that, the upper fixing block 12 and lower fixing block 13 are screwed to form one unit, and the stepped structure formed by the connection of the bottom edge of the upper fixing block 12 and the connection top face of the lower fixing block 13 is used to connect the side edge of the base board 21, and the rotating handle 11 is pushed to the U-shaped stepped hole 121 of the upper fixing block 12 so that the protruded edge 111 at the bottom seat of the rotating handle 11 is exactly mounted into the bottom hole of the stepped hole 121. An insertion peg 14 is inserted into the through hole 122 at the opening of the stepped hole 121 and the insertion peg 14 urges the protruded edge 111 of the rotating handle 11 and urges the external diameter of the hollow cylindrical body 110 of the rotating handle 11 so that the rotating handle 11 can be axially rotated (as shown in FIG. 5) at the space formed by the stepped hole 121 and the insertion peg 14. The wall of the stepped hole 121 is provided with a positioning device 123 and the cylindrical body of the rotating handle is provided with the positioning hole 112 so that when the rotating handle 11 rotates 90 degree, one positioning action is obtained. Thus, the holding kit 1 formed by the rotating handle 11, the upper fixing block 12 and the lower fixing block 13 together with the heat sinks 3 within the rotating handle 11 can be manually placed onto the molding die 4. The bottom edge 131 urges the side edge of the molding die 4. The positioning point 134 of the surrounding path 42 aligns with the surrounding path 42 of the molding die 4 such that the rectangular through hole 132 aligns with the mold cavity 41. When the rotating handle 11 rotates to the last heat sink at the shape-forming hole 113 and aligns with the rectangular through hole 132, the positioning hole 112 of the handle 11 and the positioning device 123 is in alignment, and the last heat sink 3 at the shape-forming hole 113 is arranged at the mold cavity 41 from the rectangular through hole 132. After that the base edge 131 of the lower fixing block 13 is slided to the next cavity 41, and after the positioning point 134 is aligned at the surrounding path 42 of the cavity 41, the handle 11 rotates to 90 degree so that the last heat sink 3 is arranged at the cavity 41 (as shown in FIG. 6).

[0027]FIG. 7 is another preferred embodiment in accordance with the present invention. In accordance with this preferred embodiment, the storage rack 5 includes:

[0028] (a) a bottom plate 51 being a rectangular in shape having a plurality of equally distributed binding holes 512 with four as a unit to form a locking hole 513; and

[0029] (b) a pair of supporting board 52 located at the two sides of the bottom plate 51 and a shoulder section 520 being formed at a recess formed on the inner side surface of the board 52 for the mounting of the bottom plate 51 and a side hole 511 being mounted with screw 522 for mounting with the bottom plate 51.

[0030] The bottom plate 51 is placed horizontally and the binding hole 512 faces upward and the supporting board 52 at the two lateral sides are mounted at the ends to form a storage rack 5. As the bottom plate 51 and the covering plate 51 are of the same shape, two storage racks can be used for holding stacked heat sinks 3. One for the heat sinks 3 at the front position, one for the heat sinks at the back position. To place the heat sinks 3 to the front storage rack 2 the screw for the covering plate 51 is first removed. To place heat sinks 3 to the back position of the storage rack 2, the entire storage rack 5 rotates up-down for 180 degree such that the stacked heat sinks 3 at the rear position become the front position and the bottom plate 51 becomes the covering plate 51. After that, the covering plate 51 at the top face is removed.

[0031] While the invention has been described with respect to preferred embodiments, it will be clear to those skilled in the art that modifications and improvements may be made to the invention without departing from the spirit and scope of the invention. Therefore, the invention is not to be limited by the specific illustrative embodiment, but only by the scope of the appended claims. 

I claim:
 1. A heat sink holding kit and a storage rack for semiconductor chip, the holding kit comprising (a) a top fixing block being square in shape having a U-shaped stepped hole at the center and the opening ends of the stepped hole being provided with through hole for the insertion of an insertion peg and the top end of the stepped hole being provided with screw hole for the positioning of positioning ball positioning device with elasticity; (b) a bottom fixing block being a rectangular shaped block having a base edge for positioning, and having a rectangular through hole suitably for heat sinks at the top face thereof and a circular shallow slot for the heat sinks to rotate within the circular shallow slot; and (c) a rotating handle having a vertical hollow cylindrical body provided with a forming slot at the center thereof to allow the insertion of heat sinks from the storage rack so as to provide storage space for the heat sinks and a shallow slot being located at the bottom face of the hollow cylindrical body forming by the revolution of 5 degree by the forming hole, the bottom of the cylindrical body being a protruded edge so that the edge can engage with the stepped hole and the bottom face of the cylindrical body and the top face of the positioning block without forming a gap, the lower side of the hollow cylindrical body provided with four equally distributed positioning holes which match the positioning device of the upper fixing block, i.e., in the course of positioning the heat sinks aligned with the rectangular through hole of the lower positioning block so as to disperse the heat sinks.
 2. The holding kit and the storage rack as set forth in claim 1, wherein the storage rack comprises (a) a base board being rectangular in shape having a plurality sets of four binding holes on the top face thereof as a set of locking hole; (b) a pair of supporting boards mounted at the two lateral sides of the base board and fixed to the base board with screw, and a screw hole being provided on the supporting board for the screwing of an upper covering plate; (c) the upper covering plate being a flat plate mounted at the top face of the supporting board to cover the end face of a guiding peg located on the locking hole so as to prevent dislocation of the heat sinks and isolation blocks; and (d) a plurality of guiding pegs mounted to the locking hole on the base board allowing the long heat sinks passed through the guiding peg alternately and stacked to form a column-like structure having inserted with the isolation block; and the guiding block being inserted into the stacked heat sinks with a rotating handle and being able to withdraw from insertion.
 3. The holding kit and storage rack as set forth in claim 1, the storage rack includes (a) a bottom plate being a rectangular in shaped having a plurality of equally distributed binding holes with which form as a unit to form a locking hole; (b) a pair of supporting board located at the two sides of the bottom plate and a shoulder section being formed at a recess on the inner side surface of the board for the mounting of the bottom plate and a side hole being mounted with screw for mounting with the bottom plate the bottom plate being placed horizontally and the binding hole faced upward and the supporting board being mounted at the two lateral sides. 